I refreshed my memories with Windows7 and I must say, distortions I've said
about earlier might be a software issue, because I didn't see them on plain
desktop. So everything feels fine in Windows7 I sketched several pictures
there with my natural style and handling, but didn't notice anything
outrageously wrong. I must admit cursor don't coincide exactly with the tip
as in Linux, even after a so called "calibration", but still everything
feels normal. I can't get any logs from there so you just have my word. I
have only one pen, and it is the same in either case.
On Sun, Jan 23, 2011 at 21:41, AndrewP <[email protected]> wrote:
> Chris, I managed to try your suggestions:
> this "if (!coord.tip && !coord.eraser) ds->pressure = 0; " didn't discard
> "false" clicks. As there is Tip pressure reported by isdv4-debugger.
> 2. and "if(ds->pressure > 128) ds->pressure = 0;" possibly shoved off more
> than we needed, because I lost click instantly, and couldn't achieve getting
> a pressure level. I mean I press on the screen clicking on something, but
> even I still press click is gone.
>
> I did have "false" clicks in Windows 7, but far less frequently, also had
> there a weird distortions on the edge of the screen, really bad ones (cursor
> will move away from the edge and click somewhere), they wasn't constant, but
> sometimes, anyway never had such thing in Linux. Only when I tilt my pen
> steeply enough cursor can get away from the edge by some 25mm, then when I
> straighten pen up a little it goes back to the tip, but never had a click
> when that happened.
>
> Do you really think it could be a pen issue? Frankly, I'm willing to
> believe that, because it will be lesser evil for me.
> But I don't know where to find a compatible pen, could you tell me which
> one I can try to find? if getting another one I wish to get thicker one more
> like Intuos Grip Pen.
>
>
>
> On Fri, Jan 21, 2011 at 14:51, Chris Bagwell <[email protected]> wrote:
>
>> Wow, I do not know where i got line 171 from. Its around line 721
>> that it needs to be done. To give you some context, it would be added
>> after this to reset pressure values:
>>
>> /* pressure */
>> ds->pressure = coord.pressure;
>>
>> BTW, Nicolas posted agreeing with Ping that tilt issue sounds very
>> much like a stylus problem.
>>
>> Can you confirm one more time that you do not see similar behavior
>> under Windows with same stylus? I think I recall you saying behavior
>> is different. Is it different after you made MaxZ=255 change?
>>
>> Chris
>>
>> On Fri, Jan 21, 2011 at 12:16 AM, AndrewP <[email protected]> wrote:
>> > Are you sure it should go there? I couldn't compile with this
>> correction.
>> > http://dpaste.org/dF7J/
>> > On Thu, Jan 20, 2011 at 14:21, Chris Bagwell <[email protected]>
>> wrote:
>> >>
>> >> So, it sounds like its basically working for you now?
>> >>
>> >> For tilt reporting pressure, I suspect this is just way inductive
>> >> technology works with limitations touchscreens impose. Maybe Ping can
>> >> confirm.
>> >>
>> >> The only additional tweaks I can think of:
>> >>
>> >> 1) Maybe pressure values from hardware should be ignored unless either
>> >> tip or eraser press is reported by hardware. Does tip/eraser map to a
>> >> real internal button indicating physical touch? I suspect so since
>> >> there is a delay in ability to detect pin vs. eraser.
>> >>
>> >> To test this idea, edit wcmISDV4.c around line 171 and add "if
>> >> (!coord.tip && !coord.eraser) ds->pressure = 0;"
>> >>
>> >> 2) Maybe hardware is reporting maximum of 127 values for a reason.
>> >> Even though its returning 0-255 we might need to ignore all pressure
>> >> values below 128.
>> >>
>> >> To test this idea, edit wcmISDV4.c around line 171 and add if
>> >> (ds->pressure > 128) ds->pressure = 0;"
>> >>
>> >> Chris
>> >>
>> >> On Thu, Jan 20, 2011 at 4:30 AM, AndrewP <[email protected]> wrote:
>> >> > Finally I saw maxZ=255 in Xorg.0.log when set maxZ to 255 in git
>> drivers
>> >> > also xinput shows level 2048 when I press much stronger. But still it
>> >> > catches
>> >> > pressure very willingly:
>> >> > I get values about 800-1000 with light press.
>> >> > 0-168 when not even touching it. Don't see anything wrong when
>> holding
>> >> > pen
>> >> > exactly straight up. But when holding in my natural way it's even up
>> to
>> >> > 168.
>> >> > If I tilt it
>> >> > even more I get values around 600-800 easily (no touching).
>> >> > After values of 1600 it feels pretty linear.
>> >> > Tried several Threshold values as it should be it affect only when
>> >> > "click"
>> >> > is actually
>> >> > recognized, thus limiting a pressure range.
>> >> > On Wed, Jan 19, 2011 at 15:02, Chris Bagwell <[email protected]>
>> >> > wrote:
>> >> >>
>> >> >> On Tue, Jan 18, 2011 at 4:18 PM, AndrewP <[email protected]>
>> wrote:
>> >> >> > How do I tell if some other driver is using the device?
>> >> >> > I removed tablet device from xorg.conf
>> >> >> > and I guess inputattch won't keep working if serial port is
>> already
>> >> >> > used.
>> >> >> > I get pressure in gimp but it feels way less then even 127 levels.
>> of
>> >> >> > course
>> >> >> > it is very
>> >> >> > subjective but I get around 30-40 levels and I need to press
>> really
>> >> >> > light to
>> >> >> > be able
>> >> >> > to use it.
>> >> >> >
>> >> >>
>> >> >> After you upgraded to latest git, you did not re-patch wcmISDV4.cc
>> to
>> >> >> force MaxZ to 254. Can you do that and try gimp again?
>> >> >>
>> >> >> Please realize that without this change that pressure of 127 to 254
>> >> >> will all equal 2048. Also, what did you end up setting your
>> Threshold
>> >> >> to? Somewhere around 800?
>> >> >>
>> >> >> Divide what ever that Threshold value is by 16. Example: 800/16=50.
>> >> >> So this example means that only pressures of 50-127 are useful for
>> >> >> drawing. A very small range indeed and very much shifted to light
>> >> >> pressure side.
>> >> >>
>> >> >> If you change MaxZ=254 then it becomes 800/8=100 so 100-254 are
>> valid
>> >> >> pressure ranges. A much greater range. You'll want to also adjust
>> >> >> your Threshold value down by 1/2 since Thresholds are different
>> units
>> >> >> once the MaxZ=127 bug is fixed (the 16 vs 8 I mentioned). So
>> halving
>> >> >> to Threshold=400 would give you pressure ranges of 50-254.
>> >> >>
>> >> >> Chris
>> >> >
>> >> >
>> >
>> >
>>
>
>
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